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        <li class="header">Part I</li>
        
        
    
        <li class="chapter " data-level="1.1" data-path="../../">
            
                <a href="../../">
            
                    
                    Introduction
            
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        </li>
    
        <li class="chapter " data-level="1.2" data-path="../C++必知必会的知识点/">
            
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                    C++必知必会的知识点
            
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        <li class="chapter " data-level="1.2.1" data-path="../C++必知必会的知识点/如何成为一名合格的CC++开发者？.html">
            
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                    如何成为一名合格的C/C++开发者？
            
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        </li>
    
        <li class="chapter " data-level="1.2.2" data-path="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                <a href="../C++必知必会的知识点/不定参数函数实现var_arg系列的宏.html">
            
                    
                    不定参数函数实现var_arg系列的宏
            
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        </li>
    
        <li class="chapter " data-level="1.2.3" data-path="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                <a href="../C++必知必会的知识点/你一定要搞明白的C函数调用方式与栈原理.html">
            
                    
                    你一定要搞明白的C函数调用方式与栈原理
            
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        <li class="chapter " data-level="1.2.4" data-path="../C++必知必会的知识点/深入理解CC++中的指针.html">
            
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                    深入理解C/C++中的指针
            
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                    详解C++11中的智能指针
            
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                    C++17结构化绑定
            
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                    C++必须掌握的pimpl惯用法
            
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                <a href="../C++必知必会的知识点/用VisualStudio调试Linux程序.html">
            
                    
                    用Visual Studio调试Linux程序
            
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        <li class="chapter " data-level="1.2.9" data-path="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                <a href="../C++必知必会的知识点/如何使用VisualStudio管理和阅读开源项目代码.html">
            
                    
                    如何使用Visual Studio管理和阅读开源项目代码
            
                </a>
            

            
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        <li class="chapter " data-level="1.2.10" data-path="../C++必知必会的知识点/利用cmake工具生成VisualStudio工程文件.html">
            
                <a href="../C++必知必会的知识点/利用cmake工具生成VisualStudio工程文件.html">
            
                    
                    利用cmake工具生成Visual Studio工程文件
            
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        <li class="chapter " data-level="1.3" data-path="../多线程/">
            
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                    多线程
            
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        <li class="chapter " data-level="1.3.1" data-path="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                <a href="../多线程/后台C++开发你一定要知道的条件变量.html">
            
                    
                    后台C++开发你一定要知道的条件变量
            
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        <li class="chapter " data-level="1.3.2" data-path="../多线程/整型变量赋值是原子操作吗？.html">
            
                <a href="../多线程/整型变量赋值是原子操作吗？.html">
            
                    
                    整型变量赋值是原子操作吗？
            
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            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="2.1" data-path="../网络编程/">
            
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                    网络编程
            
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            <ul class="articles">
                
    
        <li class="chapter " data-level="2.1.1" data-path="../网络编程/bind函数重难点解析.html">
            
                <a href="../网络编程/bind函数重难点解析.html">
            
                    
                    bind 函数重难点解析
            
                </a>
            

            
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        <li class="chapter " data-level="2.1.2" data-path="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                <a href="../网络编程/connect函数在阻塞和非阻塞模式下的行为.html">
            
                    
                    connect 函数在阻塞和非阻塞模式下的行为
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.3" data-path="../网络编程/select函数重难点解析.html">
            
                <a href="../网络编程/select函数重难点解析.html">
            
                    
                    select 函数重难点解析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.4" data-path="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                <a href="../网络编程/Linuxepoll模型（含LT模式和ET模式详解）.html">
            
                    
                    Linux epoll 模型（含LT 模式和 ET 模式详解）
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.5" data-path="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                <a href="../网络编程/socket的阻塞模式和非阻塞模式.html">
            
                    
                    socket 的阻塞模式和非阻塞模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.6" data-path="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                <a href="../网络编程/非阻塞模式下send和recv函数的返回值.html">
            
                    
                    非阻塞模式下 send 和 recv 函数的返回值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.7" data-path="../网络编程/服务器开发通信协议设计介绍.html">
            
                <a href="../网络编程/服务器开发通信协议设计介绍.html">
            
                    
                    服务器开发通信协议设计介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.8" data-path="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                <a href="../网络编程/TCP协议如何解决粘包、半包问题.html">
            
                    
                    TCP 协议如何解决粘包、半包问题
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.9" data-path="../网络编程/网络通信中收发数据的正确姿势.html">
            
                <a href="../网络编程/网络通信中收发数据的正确姿势.html">
            
                    
                    网络通信中收发数据的正确姿势
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="2.1.10" data-path="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                <a href="../网络编程/服务器端发数据时，如果对端一直不收，怎么办？.html">
            
                    
                    服务器端发数据时，如果对端一直不收，怎么办？
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="3.1" data-path="../程序员必知必会的网络命令/">
            
                <a href="../程序员必知必会的网络命令/">
            
                    
                    程序员必知必会的网络命令
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="3.1.1" data-path="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                <a href="../程序员必知必会的网络命令/利用telnet命令发电子邮件.html">
            
                    
                    利用telnet命令发电子邮件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.2" data-path="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                <a href="../程序员必知必会的网络命令/做Java或者C++开发都应该知道的lsof命令.html">
            
                    
                    做Java或者C++开发都应该知道的lsof命令
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.3" data-path="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                <a href="../程序员必知必会的网络命令/Linux网络故障排查的瑞士军刀.html">
            
                    
                    Linux网络故障排查的瑞士军刀nc命令
            
                </a>
            

            
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        <li class="chapter " data-level="3.1.4" data-path="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                <a href="../程序员必知必会的网络命令/Linuxtcpdump使用介绍.html">
            
                    
                    Linux tcpdump使用详解
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.5" data-path="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                <a href="../程序员必知必会的网络命令/从抓包的角度分析connect函数的连接过程.html">
            
                    
                    从抓包的角度分析connect函数的连接过程
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="3.1.6" data-path="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                <a href="../程序员必知必会的网络命令/服务器开发中网络数据分析与故障排查经验漫谈.html">
            
                    
                    服务器开发中网络数据分析与故障排查经验漫谈
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part II</li>
        
        
    
        <li class="chapter " data-level="4.1" data-path="../高性能服务器框架设计/">
            
                <a href="../高性能服务器框架设计/">
            
                    
                    高性能服务器框架设计
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="4.1.1" data-path="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                <a href="../高性能服务器框架设计/主线程与工作线程的分工.html">
            
                    
                    主线程与工作线程的分工
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.2" data-path="../高性能服务器框架设计/Reactor模式.html">
            
                <a href="../高性能服务器框架设计/Reactor模式.html">
            
                    
                    Reactor模式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.3" data-path="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                <a href="../高性能服务器框架设计/实例：一个服务器程序的架构介绍.html">
            
                    
                    实例：一个服务器程序的架构介绍
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.4" data-path="../高性能服务器框架设计/错误码系统的设计.html">
            
                <a href="../高性能服务器框架设计/错误码系统的设计.html">
            
                    
                    错误码系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.5" data-path="../高性能服务器框架设计/日志系统的设计.html">
            
                <a href="../高性能服务器框架设计/日志系统的设计.html">
            
                    
                    日志系统的设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.6" data-path="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                <a href="../高性能服务器框架设计/如何设计断线自动重连机制.html">
            
                    
                    如何设计断线自动重连机制
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.7" data-path="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                <a href="../高性能服务器框架设计/心跳包机制设计详解.html">
            
                    
                    心跳包机制设计详解
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.8" data-path="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                <a href="../高性能服务器框架设计/业务数据处理一定要单独开线程吗.html">
            
                    
                    业务数据处理一定要单独开线程吗
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="4.1.9" data-path="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                <a href="../高性能服务器框架设计/C++高性能服务器网络框架设计细节.html">
            
                    
                    C++ 高性能服务器网络框架设计细节
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="5.1" data-path="../服务器开发案例实战/">
            
                <a href="../服务器开发案例实战/">
            
                    
                    服务器开发案例实战
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="5.1.1" data-path="../服务器开发案例实战/从零实现一个http服务器.html">
            
                <a href="../服务器开发案例实战/从零实现一个http服务器.html">
            
                    
                    从零实现一个http服务器
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.2" data-path="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                <a href="../服务器开发案例实战/从零实现一款12306刷票软件.html">
            
                    
                    从零实现一款12306刷票软件
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.3" data-path="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                <a href="../服务器开发案例实战/从零实现一个邮件收发客户端.html">
            
                    
                    从零实现一个邮件收发客户端
            
                </a>
            

            
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        <li class="chapter " data-level="5.1.4" data-path="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                <a href="../服务器开发案例实战/从零开发一个WebSocket服务器.html">
            
                    
                    从零开发一个WebSocket服务器
            
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        <li class="chapter " data-level="5.1.5" data-path="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                <a href="../服务器开发案例实战/1从一款多人联机实时对战游戏开始.html">
            
                    
                    从零学习开源项目系列（一） 从一款多人联机实时对战游戏开始
            
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        <li class="chapter " data-level="5.1.6" data-path="../服务器开发案例实战/2最后一战概况.html">
            
                <a href="../服务器开发案例实战/2最后一战概况.html">
            
                    
                    从零学习开源项目系列（二） 最后一战概况
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.7" data-path="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                <a href="../服务器开发案例实战/3CSBattleMgr服务源码研究.html">
            
                    
                    从零学习开源项目系列（三） CSBattleMgr服务源码研究
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="5.1.8" data-path="../服务器开发案例实战/4LogServer源码探究.html">
            
                <a href="../服务器开发案例实战/4LogServer源码探究.html">
            
                    
                    从零学习开源项目系列（四）LogServer源码探究
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part III</li>
        
        
    
        <li class="chapter " data-level="6.1" data-path="../TeamTalk源码解析/">
            
                <a href="../TeamTalk源码解析/">
            
                    
                    TeamTalk IM源码分析
            
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        <li class="chapter " data-level="6.1.1" data-path="../TeamTalk源码解析/01TeamTalk介绍.html">
            
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                    01 TeamTalk介绍
            
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        <li class="chapter " data-level="6.1.2" data-path="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                <a href="../TeamTalk源码解析/02服务器端的程序的编译与部署.html">
            
                    
                    02 服务器端的程序的编译与部署
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.3" data-path="../TeamTalk源码解析/03服务器端的程序架构介绍.html">
            
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                    03 服务器端的程序架构介绍
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.4" data-path="../TeamTalk源码解析/04服务器端db_proxy_server源码分析.html">
            
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                    04 服务器端db_proxy_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.5" data-path="../TeamTalk源码解析/05服务器端msg_server源码分析.html">
            
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                    05 服务器端msg_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.6" data-path="../TeamTalk源码解析/06服务器端login_server源码分析.html">
            
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                    06 服务器端login_server源码分析
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.7" data-path="../TeamTalk源码解析/07服务器端msfs源码分析.html">
            
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                    07 服务器端msfs源码分析
            
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        <li class="chapter " data-level="6.1.8" data-path="../TeamTalk源码解析/08服务器端file_server源码分析.html">
            
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                    08 服务器端file_server源码分析
            
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        <li class="chapter " data-level="6.1.9" data-path="../TeamTalk源码解析/09服务器端route_server源码分析.html">
            
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                    09 服务器端route_server源码分析
            
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        <li class="chapter " data-level="6.1.10" data-path="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                <a href="../TeamTalk源码解析/10开放一个TeamTalk测试服务器地址和几个测试账号.html">
            
                    
                    10 开放一个TeamTalk测试服务器地址和几个测试账号
            
                </a>
            

            
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        <li class="chapter " data-level="6.1.11" data-path="../TeamTalk源码解析/11pc客户端源码分析.html">
            
                <a href="../TeamTalk源码解析/11pc客户端源码分析.html">
            
                    
                    11 pc客户端源码分析
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="7.1" data-path="../libevent源码深度剖析/">
            
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                    libevent源码深度剖析
            
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                    libevent源码深度剖析01
            
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        <li class="chapter " data-level="7.1.2" data-path="../libevent源码深度剖析/libevent源码深度剖析02.html">
            
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                    libevent源码深度剖析02
            
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        <li class="chapter " data-level="7.1.3" data-path="../libevent源码深度剖析/libevent源码深度剖析03.html">
            
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                    libevent源码深度剖析03
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.4" data-path="../libevent源码深度剖析/libevent源码深度剖析04.html">
            
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                    libevent源码深度剖析04
            
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        <li class="chapter " data-level="7.1.5" data-path="../libevent源码深度剖析/libevent源码深度剖析05.html">
            
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                    libevent源码深度剖析05
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.6" data-path="../libevent源码深度剖析/libevent源码深度剖析06.html">
            
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                    libevent源码深度剖析06
            
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        <li class="chapter " data-level="7.1.7" data-path="../libevent源码深度剖析/libevent源码深度剖析07.html">
            
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                    libevent源码深度剖析07
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.1.8" data-path="../libevent源码深度剖析/libevent源码深度剖析08.html">
            
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                    libevent源码深度剖析08
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.1.9" data-path="../libevent源码深度剖析/libevent源码深度剖析09.html">
            
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                    libevent源码深度剖析09
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.10" data-path="../libevent源码深度剖析/libevent源码深度剖析10.html">
            
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                    libevent源码深度剖析10
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.1.11" data-path="../libevent源码深度剖析/libevent源码深度剖析11.html">
            
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                    libevent源码深度剖析11
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="7.1.12" data-path="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                <a href="../libevent源码深度剖析/libevent源码深度剖析12.html">
            
                    
                    libevent源码深度剖析12
            
                </a>
            

            
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        <li class="chapter " data-level="7.1.13" data-path="../libevent源码深度剖析/libevent源码深度剖析13.html">
            
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                    libevent源码深度剖析13
            
                </a>
            

            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="7.2" data-path="./">
            
                <a href="./">
            
                    
                    leveldb源码分析
            
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        <li class="chapter " data-level="7.2.1" data-path="leveldb源码分析1.html">
            
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                    leveldb源码分析1
            
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        <li class="chapter " data-level="7.2.2" data-path="leveldb源码分析2.html">
            
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                    leveldb源码分析2
            
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        <li class="chapter " data-level="7.2.3" data-path="leveldb源码分析3.html">
            
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                    leveldb源码分析3
            
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        <li class="chapter " data-level="7.2.4" data-path="leveldb源码分析4.html">
            
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                    leveldb源码分析4
            
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        </li>
    
        <li class="chapter " data-level="7.2.5" data-path="leveldb源码分析5.html">
            
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                    leveldb源码分析5
            
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        <li class="chapter " data-level="7.2.6" data-path="leveldb源码分析6.html">
            
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                    leveldb源码分析6
            
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        </li>
    
        <li class="chapter " data-level="7.2.7" data-path="leveldb源码分析7.html">
            
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                    leveldb源码分析7
            
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        </li>
    
        <li class="chapter active" data-level="7.2.8" data-path="leveldb源码分析8.html">
            
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                    leveldb源码分析8
            
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        </li>
    
        <li class="chapter " data-level="7.2.9" data-path="leveldb源码分析9.html">
            
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                    leveldb源码分析9
            
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        </li>
    
        <li class="chapter " data-level="7.2.10" data-path="leveldb源码分析10.html">
            
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                    leveldb源码分析10
            
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        <li class="chapter " data-level="7.2.11" data-path="leveldb源码分析11.html">
            
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                    leveldb源码分析11
            
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        <li class="chapter " data-level="7.2.12" data-path="leveldb源码分析12.html">
            
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                    leveldb源码分析12
            
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        <li class="chapter " data-level="7.2.13" data-path="leveldb源码分析13.html">
            
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                    leveldb源码分析13
            
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        <li class="chapter " data-level="7.2.14" data-path="leveldb源码分析14.html">
            
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                    leveldb源码分析14
            
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        <li class="chapter " data-level="7.2.15" data-path="leveldb源码分析15.html">
            
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                    leveldb源码分析15
            
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        <li class="chapter " data-level="7.2.16" data-path="leveldb源码分析16.html">
            
                <a href="leveldb源码分析16.html">
            
                    
                    leveldb源码分析16
            
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        <li class="chapter " data-level="7.2.17" data-path="leveldb源码分析17.html">
            
                <a href="leveldb源码分析17.html">
            
                    
                    leveldb源码分析17
            
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        <li class="chapter " data-level="7.2.18" data-path="leveldb源码分析18.html">
            
                <a href="leveldb源码分析18.html">
            
                    
                    leveldb源码分析18
            
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        <li class="chapter " data-level="7.2.19" data-path="leveldb源码分析19.html">
            
                <a href="leveldb源码分析19.html">
            
                    
                    leveldb源码分析19
            
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        <li class="chapter " data-level="7.2.20" data-path="leveldb源码分析20.html">
            
                <a href="leveldb源码分析20.html">
            
                    
                    leveldb源码分析20
            
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        </li>
    
        <li class="chapter " data-level="7.2.21" data-path="leveldb源码分析21.html">
            
                <a href="leveldb源码分析21.html">
            
                    
                    leveldb源码分析21
            
                </a>
            

            
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        <li class="chapter " data-level="7.2.22" data-path="leveldb源码分析22.html">
            
                <a href="leveldb源码分析22.html">
            
                    
                    leveldb源码分析22
            
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            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="8.1" data-path="../Memcached源码分析/">
            
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                    Memcached源码分析
            
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        <li class="chapter " data-level="8.1.1" data-path="../Memcached源码分析/00服务器资源调整.html">
            
                <a href="../Memcached源码分析/00服务器资源调整.html">
            
                    
                    00 服务器资源调整
            
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        <li class="chapter " data-level="8.1.2" data-path="../Memcached源码分析/01初始化参数解析.html">
            
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                    01 初始化参数解析
            
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        <li class="chapter " data-level="8.1.3" data-path="../Memcached源码分析/02网络监听的建立.html">
            
                <a href="../Memcached源码分析/02网络监听的建立.html">
            
                    
                    02 网络监听的建立
            
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        <li class="chapter " data-level="8.1.4" data-path="../Memcached源码分析/03网络连接建立.html">
            
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                    03 网络连接建立
            
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        <li class="chapter " data-level="8.1.5" data-path="../Memcached源码分析/04内存初始化.html">
            
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                    04 内存初始化
            
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        <li class="chapter " data-level="8.1.6" data-path="../Memcached源码分析/05资源初始化.html">
            
                <a href="../Memcached源码分析/05资源初始化.html">
            
                    
                    05 资源初始化
            
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        <li class="chapter " data-level="8.1.7" data-path="../Memcached源码分析/06get过程.html">
            
                <a href="../Memcached源码分析/06get过程.html">
            
                    
                    06 get过程
            
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        <li class="chapter " data-level="8.1.8" data-path="../Memcached源码分析/07cas属性.html">
            
                <a href="../Memcached源码分析/07cas属性.html">
            
                    
                    07 cas属性
            
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        <li class="chapter " data-level="8.1.9" data-path="../Memcached源码分析/08内存池.html">
            
                <a href="../Memcached源码分析/08内存池.html">
            
                    
                    08 内存池
            
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        <li class="chapter " data-level="8.1.10" data-path="../Memcached源码分析/09连接队列.html">
            
                <a href="../Memcached源码分析/09连接队列.html">
            
                    
                    09 连接队列
            
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        <li class="chapter " data-level="8.1.11" data-path="../Memcached源码分析/10Hash表操作.html">
            
                <a href="../Memcached源码分析/10Hash表操作.html">
            
                    
                    10 Hash表操作
            
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        <li class="chapter " data-level="8.1.12" data-path="../Memcached源码分析/12set操作.html">
            
                <a href="../Memcached源码分析/12set操作.html">
            
                    
                    12 set操作
            
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        <li class="chapter " data-level="8.1.13" data-path="../Memcached源码分析/13do_item_alloc操作.html">
            
                <a href="../Memcached源码分析/13do_item_alloc操作.html">
            
                    
                    13 do_item_alloc操作
            
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        <li class="chapter " data-level="8.1.14" data-path="../Memcached源码分析/14item结构.html">
            
                <a href="../Memcached源码分析/14item结构.html">
            
                    
                    14 item结构
            
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        <li class="chapter " data-level="8.1.15" data-path="../Memcached源码分析/15Hash表扩容.html">
            
                <a href="../Memcached源码分析/15Hash表扩容.html">
            
                    
                    15 Hash表扩容
            
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        <li class="chapter " data-level="8.1.16" data-path="../Memcached源码分析/16线程交互.html">
            
                <a href="../Memcached源码分析/16线程交互.html">
            
                    
                    16 线程交互
            
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        <li class="chapter " data-level="8.1.17" data-path="../Memcached源码分析/17状态机.html">
            
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                    17 状态机
            
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        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="divider"></li>
        
        
    
        <li class="chapter " data-level="9.1" data-path="../游戏开发专题/">
            
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                    游戏开发专题
            
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                    1 游戏服务器开发的基本体系与服务器端开发的一些建议
            
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        <li class="chapter " data-level="9.1.2" data-path="../游戏开发专题/2网络游戏服务器开发框架设计介绍.html">
            
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                    2 网络游戏服务器开发框架设计介绍
            
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        <li class="chapter " data-level="9.1.3" data-path="../游戏开发专题/3游戏后端开发需要掌握的知识.html">
            
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                    3 游戏后端开发需要掌握的知识
            
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        <li class="chapter " data-level="9.1.4" data-path="../游戏开发专题/4关于游戏服务端架构的整理.html">
            
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                    4 关于游戏服务端架构的整理
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.5" data-path="../游戏开发专题/5各类游戏对应的服务端架构.html">
            
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                    5 各类游戏对应的服务端架构
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.6" data-path="../游戏开发专题/6从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则.html">
            
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                    6 从腾讯QQgame高性能服务器集群架构看“分而治之”与“自治”等分布式架构设计原则
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.7" data-path="../游戏开发专题/7QQ游戏百万人同时在线服务器架构实现.html">
            
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                    7 QQ游戏百万人同时在线服务器架构实现
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.8" data-path="../游戏开发专题/8大型多人在线游戏服务器架构设计.html">
            
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                    8 大型多人在线游戏服务器架构设计
            
                </a>
            

            
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        <li class="chapter " data-level="9.1.9" data-path="../游戏开发专题/9百万用户级游戏服务器架构设计.html">
            
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                    9 百万用户级游戏服务器架构设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.10" data-path="../游戏开发专题/10十万在线的WebGame的数据库设计思路.html">
            
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                    10 十万在线的WebGame的数据库设计思路
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.11" data-path="../游戏开发专题/11一种高性能网络游戏服务器架构设计.html">
            
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                    11 一种高性能网络游戏服务器架构设计
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="9.1.12" data-path="../游戏开发专题/12经典游戏服务器端架构概述.html">
            
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                    12 经典游戏服务器端架构概述
            
                </a>
            

            
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                    13 游戏跨服架构进化之路
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    

    
        
        <li class="header">Part IV</li>
        
        
    
        <li class="chapter " data-level="10.1" data-path="../程序员面试题精讲/">
            
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                </a>
            

            
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                </a>
            

            
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                </a>
            

            
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                    聊聊技术人员的常见的职业问题
            
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        <li class="chapter " data-level="10.2.3" data-path="../职业规划/写给那些傻傻想做服务器开发的朋友.html">
            
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                </a>
            

            
        </li>
    

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        </li>
    
        <li class="chapter " data-level="10.3" data-path="../自我提升与开源代码/">
            
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            <ul class="articles">
                
    
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                </a>
            

            
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                </a>
            

            
        </li>
    

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        <li class="chapter " data-level="10.5" data-path="../程序员的简历/">
            
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                </a>
            

            
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                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="10.6" data-path="../程序员的薪资与年终奖那些事儿/">
            
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        <li class="chapter " data-level="10.8" data-path="../作者的故事/">
            
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                    我的 2019
            
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<p>&#x4E0B;&#x9762;&#x6765;&#x770B;&#x770B;&#x6D89;&#x53CA;&#x5230;&#x7684;&#x7C7B;&#xFF0C;&#x5982;&#x56FE;6.3-1&#x6240;&#x793A;&#x3002;<img src="" alt="img">&#x56FE;6.3-1</p>
<p>&#x5176;&#x4E2D;<strong>WritableFile&#x548C;op log</strong>&#x4E00;&#x6837;&#xFF0C;&#x4F7F;&#x7528;&#x7684;&#x90FD;&#x662F;<strong>&#x5185;&#x5B58;&#x6620;&#x5C04;</strong>&#x6587;&#x4EF6;&#x3002;Options&#x662F;&#x4E00;&#x4E9B;&#x8C03;&#x7528;&#x8005;&#x53EF;&#x8BBE;&#x7F6E;&#x7684;&#x9009;&#x9879;&#x3002;</p>
<p>TableBuilder&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x6210;&#x5458;&#x53D8;&#x91CF;<strong>Rep* rep_</strong>&#xFF0C;&#x5B9E;&#x9645;&#x4E0A;Rep&#x7ED3;&#x6784;&#x4F53;&#x7684;&#x6210;&#x5458;&#x5C31;&#x662F;TableBuilder&#x6240;&#x6709;&#x7684;&#x6210;&#x5458;&#x53D8;&#x91CF;&#xFF1B;&#x8FD9;&#x6837;&#x505A;&#x7684;<strong>&#x76EE;&#x7684;</strong>&#xFF0C;<strong>&#x53EF;&#x80FD;&#x662F;&#x4E3A;&#x4E86;&#x9690;&#x85CF;&#x5176;&#x5185;&#x90E8;&#x7EC6;</strong>&#x8282;&#x3002;Rep&#x7684;&#x5B9A;&#x4E49;&#x4E5F;&#x662F;&#x5728;.cc&#x6587;&#x4EF6;&#x4E2D;&#xFF0C;&#x5BF9;&#x5916;&#x662F;&#x900F;&#x660E;&#x7684;&#x3002;</p>
<p>&#x7B80;&#x5355;&#x89E3;&#x91CA;&#x4E0B;&#x6210;&#x5458;&#x7684;&#x542B;&#x4E49;&#xFF1A;</p>
<pre class="language-"><code>Options options;              // data block&#x7684;&#x9009;&#x9879;
Options index_block_options;  // index block&#x7684;&#x9009;&#x9879;
WritableFile* file;           // sstable&#x6587;&#x4EF6;
uint64_t offset; 
// &#x8981;&#x5199;&#x5165;data block&#x5728;sstable&#x6587;&#x4EF6;&#x4E2D;&#x7684;&#x504F;&#x79FB;&#xFF0C;&#x521D;&#x59CB;0
Status status;                //&#x5F53;&#x524D;&#x72B6;&#x6001;-&#x521D;&#x59CB;ok
BlockBuilder data_block;      //&#x5F53;&#x524D;&#x64CD;&#x4F5C;&#x7684;data block
BlockBuilder index_block;     // sstable&#x7684;index block
std::string last_key;         //&#x5F53;&#x524D;data block&#x6700;&#x540E;&#x7684;k/v&#x5BF9;&#x7684;key
int64_t num_entries;          //&#x5F53;&#x524D;data block&#x7684;&#x4E2A;&#x6570;&#xFF0C;&#x521D;&#x59CB;0
bool closed;                  //&#x8C03;&#x7528;&#x4E86;Finish() or Abandon()&#xFF0C;&#x521D;&#x59CB;false
FilterBlockBuilder*filter_block; 
//&#x6839;&#x636E;filter&#x6570;&#x636E;&#x5FEB;&#x901F;&#x5B9A;&#x4F4D;key&#x662F;&#x5426;&#x5728;block&#x4E2D;
bool pending_index_entry;     //&#x89C1;&#x4E0B;&#x9762;&#x7684;Add&#x51FD;&#x6570;&#xFF0C;&#x521D;&#x59CB;false
BlockHandle pending_handle;   //&#x6DFB;&#x52A0;&#x5230;index block&#x7684;data block&#x7684;&#x4FE1;&#x606F;
std::string compressed_output;//&#x538B;&#x7F29;&#x540E;&#x7684;data block&#xFF0C;&#x4E34;&#x65F6;&#x5B58;&#x50A8;&#xFF0C;&#x5199;&#x5165;&#x540E;&#x5373;&#x88AB;&#x6E05;&#x7A7A;
</code></pre><p>Filter block&#x662F;&#x5B58;&#x50A8;&#x7684;<strong>&#x8FC7;&#x6EE4;&#x5668;&#x4FE1;&#x606F;</strong>&#xFF0C;&#x5B83;&#x4F1A;&#x5B58;&#x50A8;{key, &#x5BF9;&#x5E94;data block&#x5728;sstable&#x7684;&#x504F;&#x79FB;&#x503C;}&#xFF0C;<strong>&#x4E0D;&#x4E00;&#x5B9A;</strong>&#x662F;<strong>&#x5B8C;&#x5168;&#x7CBE;&#x786E;</strong>&#x7684;&#xFF0C;&#x4EE5;&#x5FEB;&#x901F;&#x5B9A;&#x4F4D;&#x7ED9;&#x5B9A;key&#x662F;&#x5426;&#x5728;data block&#x4E2D;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x5206;&#x6790;&#x5982;&#x4F55;&#x5411;<strong>sstable&#x4E2D;&#x6DFB;&#x52A0;k/v&#x5BF9;</strong>&#xFF0C;&#x521B;&#x5EFA;&#x5E76;&#x6301;&#x4E45;&#x5316;sstable&#x3002;&#x5176;&#x5B83;&#x51FD;&#x6570;&#x90FD;&#x6BD4;&#x8F83;&#x7B80;&#x5355;&#xFF0C;&#x7565;&#x8FC7;&#x3002;&#x53E6;&#x5916;&#x5BF9;&#x4E8E;Abandon&#xFF0C;&#x7B80;&#x5355;&#x8BBE;&#x7F6E;<strong>closed=true</strong>&#x5373;&#x8FD4;&#x56DE;&#x3002;</p>
<h5 id="642-&#x6DFB;&#x52A0;kv&#x5BF9;"><a name="642-&#x6DFB;&#x52A0;kv&#x5BF9;" class="anchor-navigation-ex-anchor" href="#642-&#x6DFB;&#x52A0;kv&#x5BF9;"><i class="fa fa-link" aria-hidden="true"></i></a>6.4.2 &#x6DFB;&#x52A0;k/v&#x5BF9;</h5>
<p>&#x8FD9;&#x662F;&#x901A;&#x8FC7;&#x65B9;&#x6CD5;<strong>Add(constSlice&amp; key, const Slice&amp; value)</strong>&#x5B8C;&#x6210;&#x7684;&#xFF0C;&#x6CA1;&#x6709;&#x8FD4;&#x56DE;&#x503C;&#x3002;&#x4E0B;&#x9762;&#x5206;&#x6790;&#x4E0B;&#x51FD;&#x6570;&#x7684;&#x903B;&#x8F91;&#xFF1A;</p>
<p><em>1</em></p>
<p><strong>S1 &#x9996;&#x5148;&#x4FDD;&#x8BC1;&#x6587;&#x4EF6;&#x6CA1;&#x6709;close&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x6CA1;&#x6709;&#x8C03;&#x7528;&#x8FC7;Finish/Abandon&#xFF0C;&#x4EE5;&#x53CA;&#x4FDD;&#x8BC1;&#x5F53;&#x524D;status&#x662F;ok&#x7684;&#xFF1B;&#x5982;&#x679C;&#x5F53;&#x524D;&#x6709;&#x7F13;&#x5B58;&#x7684;kv&#x5BF9;&#xFF0C;&#x4FDD;&#x8BC1;&#x65B0;&#x52A0;&#x5165;&#x7684;key&#x662F;&#x6700;&#x5927;&#x7684;&#x3002;</strong></p>
<pre class="language-"><code>Rep* r = rep_;
assert(!r-&gt;closed);
if (!ok()) return;
if (r-&gt;num_entries &gt; 0) 
{
    assert(r-&gt;options.comparator-&gt;Compare(key, Slice(r-&gt;last_key))&gt; 0);
}
</code></pre><p><strong>S2 &#x5982;&#x679C;&#x6807;&#x8BB0;r-&gt;pending_index_entry&#x4E3A;true&#xFF0C;&#x8868;&#x660E;&#x9047;&#x5230;&#x4E0B;&#x4E00;&#x4E2A;data block&#x7684;&#x7B2C;&#x4E00;&#x4E2A;k/v&#xFF0C;&#x6839;&#x636E;key&#x8C03;&#x6574;r-&gt;last_key&#xFF0C;&#x8FD9;&#x662F;&#x901A;&#x8FC7;Comparator&#x7684;FindShortestSeparator&#x5B8C;&#x6210;&#x7684;&#x3002;</strong></p>
<pre class="language-"><code>if (r-&gt;pending_index_entry) 
{
     assert(r-&gt;data_block.empty());
     r-&gt;options.comparator-&gt;FindShortestSeparator(&amp;r-&gt;last_key,key);
     std::string handle_encoding;
     r-&gt;pending_handle.EncodeTo(&amp;handle_encoding);
     r-&gt;index_block.Add(r-&gt;last_key, Slice(handle_encoding));
     r-&gt;pending_index_entry =false;
}
</code></pre><p>&#x63A5;&#x4E0B;&#x6765;&#x5C06;pending_handle&#x52A0;&#x5165;&#x5230;<strong>index block&#x4E2D;</strong>{r-&gt;last_key, r-&gt;pending_handle&#x2019;sstring}&#x3002;&#x6700;&#x540E;&#x5C06;r-&gt;pending_index_entry&#x8BBE;&#x7F6E;&#x4E3A;false&#x3002;</p>
<p>&#x503C;&#x5F97;&#x8BB2;&#x8BB2;<strong>pending_index_entry</strong>&#x8FD9;&#x4E2A;&#x6807;&#x8BB0;&#x7684;&#x610F;&#x4E49;&#xFF0C;&#x89C1;&#x4EE3;&#x7801;&#x6CE8;&#x91CA;&#xFF1A;</p>
<p><strong>&#x76F4;&#x5230;</strong>&#x9047;&#x5230;<strong>&#x4E0B;&#x4E00;&#x4E2A;databock</strong>&#x7684;&#x7B2C;&#x4E00;&#x4E2A;key&#x65F6;&#xFF0C;&#x6211;&#x4EEC;&#x624D;&#x4E3A;&#x4E0A;&#x4E00;&#x4E2A;datablock&#x751F;&#x6210;index entry&#xFF0C;&#x8FD9;&#x6837;&#x7684;<strong>&#x597D;&#x5904;</strong>&#x662F;&#xFF1A;&#x53EF;&#x4EE5;&#x4E3A;index&#x4F7F;&#x7528;&#x8F83;&#x77ED;&#x7684;key&#xFF1B;&#x6BD4;&#x5982;&#x4E0A;&#x4E00;&#x4E2A;data block&#x6700;&#x540E;&#x4E00;&#x4E2A;k/v&#x7684;key&#x662F;&quot;the quick brown fox&quot;&#xFF0C;&#x5176;&#x540E;&#x7EE7;data block&#x7684;&#x7B2C;&#x4E00;&#x4E2A;key&#x662F;&quot;the who&quot;&#xFF0C;&#x6211;&#x4EEC;&#x5C31;&#x53EF;&#x4EE5;&#x7528;&#x4E00;&#x4E2A;<strong>&#x8F83;&#x77ED;&#x7684;&#x5B57;&#x7B26;&#x4E32;</strong>&quot;the r&quot;&#x4F5C;&#x4E3A;&#x4E0A;&#x4E00;&#x4E2A;data block&#x7684;index block entry&#x7684;key&#x3002;</p>
<p>&#x7B80;&#x800C;&#x8A00;&#x4E4B;&#xFF0C;&#x5C31;&#x662F;&#x5728;&#x5F00;&#x59CB;<strong>&#x4E0B;&#x4E00;&#x4E2A;datablock</strong>&#x65F6;&#xFF0C;Leveldb&#x624D;&#x5C06;&#x4E0A;&#x4E00;&#x4E2A;data block&#x52A0;&#x5165;&#x5230;index block&#x4E2D;&#x3002;&#x6807;&#x8BB0;<strong>pending_index_entry</strong>&#x5C31;&#x662F;&#x5E72;&#x8FD9;&#x4E2A;&#x7528;&#x7684;&#xFF0C;&#x5BF9;&#x5E94;data block&#x7684;index entry&#x4FE1;&#x606F;&#x5C31;&#x4FDD;&#x5B58;&#x5728;&#xFF08;BlockHandle&#xFF09;pending_handle&#x3002;</p>
<p><strong>S3 &#x5982;&#x679C;filter_block&#x4E0D;&#x4E3A;&#x7A7A;&#xFF0C;&#x5C31;&#x628A;key&#x52A0;&#x5165;&#x5230;filter_block&#x4E2D;&#x3002;</strong></p>
<pre class="language-"><code>if (r-&gt;filter_block != NULL) 
{
    r-&gt;filter_block-&gt;AddKey(key);
}
</code></pre><p><strong>S4 &#x8BBE;&#x7F6E;r-&gt;last_key = key&#xFF0C;&#x5C06;(key, value)&#x6DFB;&#x52A0;&#x5230;r-&gt;data_block&#x4E2D;&#xFF0C;&#x5E76;&#x66F4;&#x65B0;entry&#x6570;&#x3002;</strong></p>
<pre class="language-"><code>r-&gt;last_key.assign(key.data(), key.size());
r-&gt;num_entries++;
r-&gt;data_block.Add(key,value);
</code></pre><p><strong>S5 &#x5982;&#x679C;data block&#x7684;&#x4E2A;&#x6570;&#x8D85;&#x8FC7;&#x9650;&#x5236;&#xFF0C;&#x5C31;&#x7ACB;&#x523B;Flush&#x5230;&#x6587;&#x4EF6;&#x4E2D;&#x3002;</strong></p>
<pre class="language-"><code>const size_testimated_block_size = r-&gt;data_block.CurrentSizeEstimate();
if (estimated_block_size &gt;=r-&gt;options.block_size)  Flush();
</code></pre><h5 id="643-flush&#x6587;&#x4EF6;"><a name="643-flush&#x6587;&#x4EF6;" class="anchor-navigation-ex-anchor" href="#643-flush&#x6587;&#x4EF6;"><i class="fa fa-link" aria-hidden="true"></i></a>6.4.3 Flush&#x6587;&#x4EF6;</h5>
<p>&#x8BE5;&#x51FD;&#x6570;&#x903B;&#x8F91;&#x6BD4;&#x8F83;&#x7B80;&#x5355;&#xFF0C;&#x76F4;&#x63A5;&#x89C1;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre class="language-"><code>Rep* r = rep_;
assert(!r-&gt;closed);               // &#x9996;&#x5148;&#x4FDD;&#x8BC1;&#x672A;&#x5173;&#x95ED;&#xFF0C;&#x4E14;&#x72B6;&#x6001;ok
if (!ok()) return;
if (r-&gt;data_block.empty())return; // data block&#x662F;&#x7A7A;&#x7684;
// &#x4FDD;&#x8BC1;pending_index_entry&#x4E3A;false&#xFF0C;&#x5373;data block&#x7684;Add&#x5DF2;&#x7ECF;&#x5B8C;&#x6210;
assert(!r-&gt;pending_index_entry);
// &#x5199;&#x5165;data block&#xFF0C;&#x5E76;&#x8BBE;&#x7F6E;&#x5176;index entry&#x4FE1;&#x606F;&#x2014;BlockHandle&#x5BF9;&#x8C61;
WriteBlock(&amp;r-&gt;data_block, &amp;r-&gt;pending_handle);
//&#x5199;&#x5165;&#x6210;&#x529F;&#xFF0C;&#x5219;Flush&#x6587;&#x4EF6;&#xFF0C;&#x5E76;&#x8BBE;&#x7F6E;r-&gt;pending_index_entry&#x4E3A;true&#xFF0C;
//&#x4EE5;&#x6839;&#x636E;&#x4E0B;&#x4E00;&#x4E2A;data block&#x7684;first key&#x8C03;&#x6574;index entry&#x7684;key&#x2014;&#x5373;r-&gt;last_key
if (ok()) 
{
     r-&gt;pending_index_entry =true;
     r-&gt;status =r-&gt;file-&gt;Flush();
}
if (r-&gt;filter_block != NULL)
{ 
     //&#x5C06;data block&#x5728;sstable&#x4E2D;&#x7684;&#x4FBF;&#x5B9C;&#x52A0;&#x5165;&#x5230;filter block&#x4E2D;
     r-&gt;filter_block-&gt;StartBlock(r-&gt;offset); 
     // &#x5E76;&#x6307;&#x660E;&#x5F00;&#x59CB;&#x65B0;&#x7684;data block
}
</code></pre><h5 id="644-writeblock&#x51FD;&#x6570;"><a name="644-writeblock&#x51FD;&#x6570;" class="anchor-navigation-ex-anchor" href="#644-writeblock&#x51FD;&#x6570;"><i class="fa fa-link" aria-hidden="true"></i></a>6.4.4 WriteBlock&#x51FD;&#x6570;</h5>
<p>&#x5728;Flush&#x6587;&#x4EF6;&#x65F6;&#xFF0C;&#x4F1A;&#x8C03;&#x7528;WriteBlock&#x51FD;&#x6570;&#x5C06;data block&#x5199;&#x5165;&#x5230;&#x6587;&#x4EF6;&#x4E2D;&#xFF0C;&#x8BE5;&#x51FD;&#x6570;&#x540C;&#x65F6;&#x8FD8;&#x8BBE;&#x7F6E;<strong>data block&#x7684;index entry</strong>&#x4FE1;&#x606F;&#x3002;&#x539F;&#x578B;&#x4E3A;&#xFF1A;</p>
<pre class="language-"><code>void WriteBlock(BlockBuilder* block, BlockHandle* handle)
</code></pre><p>&#x8BE5;&#x51FD;&#x6570;&#x505A;&#x4E9B;&#x9884;&#x5904;&#x7406;&#x5DE5;&#x4F5C;&#xFF0C;<strong>&#x5E8F;&#x5217;&#x5316;</strong>&#x8981;&#x5199;&#x5165;&#x7684;data block&#xFF0C;&#x6839;&#x636E;&#x9700;&#x8981;&#x538B;&#x7F29;&#x6570;&#x636E;&#xFF0C;&#x771F;&#x6B63;&#x7684;&#x5199;&#x5165;&#x903B;&#x8F91;&#x662F;&#x5728;<strong>WriteRawBlock</strong>&#x51FD;&#x6570;&#x4E2D;&#x3002;&#x4E0B;&#x9762;&#x5206;&#x6790;&#x8BE5;&#x51FD;&#x6570;&#x7684;&#x5904;&#x7406;&#x903B;&#x8F91;&#x3002;</p>
<p><strong><em>2</em></strong></p>
<p><strong>S1 &#x83B7;&#x5F97;block&#x7684;&#x5E8F;&#x5217;&#x5316;&#x6570;&#x636E;Slice&#xFF0C;&#x6839;&#x636E;&#x914D;&#x7F6E;&#x53C2;&#x6570;&#x51B3;&#x5B9A;&#x662F;&#x5426;&#x538B;&#x7F29;&#xFF0C;&#x4EE5;&#x53CA;&#x6839;&#x636E;&#x538B;&#x7F29;&#x683C;&#x5F0F;&#x538B;&#x7F29;&#x6570;&#x636E;&#x5185;&#x5BB9;&#x3002;&#x5BF9;&#x4E8E;Snappy&#x538B;&#x7F29;&#xFF0C;&#x5982;&#x679C;&#x538B;&#x7F29;&#x7387;&#x592A;&#x4F4E;&lt;12.5%&#xFF0C;&#x8FD8;&#x662F;&#x4F5C;&#x4E3A;&#x672A;&#x538B;&#x7F29;&#x5185;&#x5BB9;&#x5B58;&#x50A8;&#x3002;</strong></p>
<p>BlockBuilder&#x7684;Finish()&#x51FD;&#x6570;&#x5C06;data block&#x7684;&#x6570;&#x636E;&#x5E8F;&#x5217;&#x5316;&#x6210;&#x4E00;&#x4E2A;<strong>Slice</strong>&#x3002;</p>
<pre class="language-"><code>Rep* r = rep_;
Slice raw = block-&gt;Finish(); 
// &#x83B7;&#x5F97;data block&#x7684;&#x5E8F;&#x5217;&#x5316;&#x5B57;&#x7B26;&#x4E32;
Slice block_contents;
CompressionType type =r-&gt;options.compression;
switch (type)
{
     case kNoCompression: block_contents= raw; break; // &#x4E0D;&#x538B;&#x7F29;
     case kSnappyCompression: 
     { 
          // snappy&#x538B;&#x7F29;&#x683C;&#x5F0F;
          std::string* compressed =&amp;r-&gt;compressed_output;
          if(port::Snappy_Compress(raw.data(), raw.size(), compressed) &amp;&amp;
             compressed-&gt;size()&lt; raw.size() - (raw.size() / 8u)) 
          {
                block_contents =*compressed;
          } 
          else 
          { 
                 // &#x5982;&#x679C;&#x4E0D;&#x652F;&#x6301;Snappy&#xFF0C;&#x6216;&#x8005;&#x538B;&#x7F29;&#x7387;&#x4F4E;&#x4E8E;12.5%&#xFF0C;&#x4F9D;&#x7136;&#x5F53;&#x4F5C;&#x4E0D;&#x538B;&#x7F29;&#x5B58;&#x50A8;
                 block_contents = raw;
                 type = kNoCompression;
          }
          break;
     }
}
</code></pre><p><strong>S2 &#x5C06;data&#x5185;&#x5BB9;&#x5199;&#x5165;&#x5230;&#x6587;&#x4EF6;&#xFF0C;&#x5E76;&#x91CD;&#x7F6E;block&#x6210;&#x521D;&#x59CB;&#x5316;&#x72B6;&#x6001;&#xFF0C;&#x6E05;&#x7A7A;compressedoutput&#x3002;</strong></p>
<pre class="language-"><code>WriteRawBlock(block_contents,type, handle);  
r-&gt;compressed_output.clear();  
block-&gt;Reset();
</code></pre><h5 id="645-writerawblock&#x51FD;&#x6570;"><a name="645-writerawblock&#x51FD;&#x6570;" class="anchor-navigation-ex-anchor" href="#645-writerawblock&#x51FD;&#x6570;"><i class="fa fa-link" aria-hidden="true"></i></a>6.4.5 WriteRawBlock&#x51FD;&#x6570;</h5>
<p>&#x5728;WriteBlock&#x628A;&#x51C6;&#x5907;&#x5DE5;&#x4F5C;&#x90FD;&#x505A;&#x597D;&#x540E;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x5199;&#x5165;&#x5230;<strong>sstable</strong>&#x6587;&#x4EF6;&#x4E2D;&#x4E86;&#x3002;&#x6765;&#x770B;&#x51FD;&#x6570;&#x539F;&#x578B;&#xFF1A;</p>
<pre class="language-"><code>void WriteRawBlock(const Slice&amp; data, CompressionType, BlockHandle*handle);
</code></pre><p>&#x51FD;&#x6570;&#x903B;&#x8F91;&#x5F88;&#x7B80;&#x5355;&#xFF0C;&#x89C1;&#x4EE3;&#x7801;&#x3002;</p>
<pre class="language-"><code>Rep* r = rep_;
handle-&gt;set_offset(r-&gt;offset); 
// &#x4E3A;index&#x8BBE;&#x7F6E;data block&#x7684;handle&#x4FE1;&#x606F;
handle-&gt;set_size(block_contents.size());
r-&gt;status =r-&gt;file-&gt;Append(block_contents); // &#x5199;&#x5165;data block&#x5185;&#x5BB9;
if (r-&gt;status.ok()) 
{
     // &#x5199;&#x5165;1byte&#x7684;type&#x548C;4bytes&#x7684;crc32
     chartrailer[kBlockTrailerSize];
     trailer[0] = type;
     uint32_t crc = crc32c::Value(block_contents.data(),
                                  block_contents.size());
     crc = crc32c::Extend(crc, trailer, 1);  // Extend crc tocover block type
     EncodeFixed32(trailer+1, crc32c::Mask(crc));
     r-&gt;status =r-&gt;file-&gt;Append(Slice(trailer, kBlockTrailerSize));
     if (r-&gt;status.ok()) 
     { 
          // &#x5199;&#x5165;&#x6210;&#x529F;&#x66F4;&#x65B0;offset-&#x4E0B;&#x4E00;&#x4E2A;data block&#x7684;&#x5199;&#x5165;&#x504F;&#x79FB;
          r-&gt;offset +=block_contents.size() + kBlockTrailerSize;
      }
}
</code></pre><h5 id="646-finish&#x51FD;&#x6570;"><a name="646-finish&#x51FD;&#x6570;" class="anchor-navigation-ex-anchor" href="#646-finish&#x51FD;&#x6570;"><i class="fa fa-link" aria-hidden="true"></i></a>6.4.6 Finish&#x51FD;&#x6570;</h5>
<p>&#x8C03;&#x7528;Finish&#x51FD;&#x6570;&#xFF0C;&#x8868;&#x660E;&#x8C03;&#x7528;&#x8005;&#x5C06;&#x6240;&#x6709;&#x5DF2;&#x7ECF;&#x6DFB;&#x52A0;&#x7684;<strong>k/v&#x5BF9;</strong>&#x6301;&#x4E45;&#x5316;&#x5230;sstable&#xFF0C;&#x5E76;&#x5173;&#x95ED;sstable&#x6587;&#x4EF6;&#x3002;</p>
<p>&#x8BE5;&#x51FD;&#x6570;&#x903B;&#x8F91;&#x5F88;&#x6E05;&#x6670;&#xFF0C;&#x53EF;<strong>&#x5206;&#x4E3A;5&#x90E8;&#x5206;</strong>&#x3002;</p>
<p><strong><em>3</em></strong></p>
<p><strong>S1 &#x9996;&#x5148;&#x8C03;&#x7528;Flush&#xFF0C;&#x5199;&#x5165;&#x6700;&#x540E;&#x7684;&#x4E00;&#x5757;data block&#xFF0C;&#x7136;&#x540E;&#x8BBE;&#x7F6E;&#x5173;&#x95ED;&#x6807;&#x5FD7;closed=true&#x3002;&#x8868;&#x660E;&#x8BE5;sstable&#x5DF2;&#x7ECF;&#x5173;&#x95ED;&#xFF0C;&#x4E0D;&#x80FD;&#x518D;&#x6DFB;&#x52A0;k/v&#x5BF9;&#x3002;</strong></p>
<pre class="language-"><code>1  Rep* r = rep_;
2  Flush();
3  assert(!r-&gt;closed);
4  r-&gt;closed = true;
5  BlockHandle filter_block_handle,metaindex_block_handle, index_block_handle;
</code></pre><p><strong>S2 &#x5199;&#x5165;filter block&#x5230;&#x6587;&#x4EF6;&#x4E2D;&#x3002;</strong></p>
<pre class="language-"><code>if (ok() &amp;&amp;r-&gt;filter_block != NULL) 
{
     WriteRawBlock(r-&gt;filter_block-&gt;Finish(), kNoCompression,&amp;filter_block_handle);
}
</code></pre><p><strong>S3 &#x5199;&#x5165;meta index block&#x5230;&#x6587;&#x4EF6;&#x4E2D;&#x3002;</strong></p>
<p>&#x5982;&#x679C;filterblock&#x4E0D;&#x4E3A;NULL&#xFF0C;&#x5219;&#x52A0;&#x5165;&#x4ECE;&quot;filter.Name&quot;&#x5230;filter data&#x4F4D;&#x7F6E;&#x7684;&#x6620;&#x5C04;&#x3002;&#x901A;&#x8FC7;<strong>meta index block</strong>&#xFF0C;&#x53EF;&#x4EE5;&#x6839;&#x636E;filter&#x540D;&#x5B57;&#x5FEB;&#x901F;&#x5B9A;&#x4F4D;&#x5230;filter&#x7684;&#x6570;&#x636E;&#x533A;&#x3002;</p>
<pre class="language-"><code>if (ok()) 
{
     BlockBuildermeta_index_block(&amp;r-&gt;options);
     if (r-&gt;filter_block !=NULL) 
     {
          //&#x52A0;&#x5165;&#x4ECE;&quot;filter.Name&quot;&#x5230;filter data&#x4F4D;&#x7F6E;&#x7684;&#x6620;&#x5C04;
          std::string key =&quot;filter.&quot;;
          key.append(r-&gt;options.filter_policy-&gt;Name());
          std::string handle_encoding;
          filter_block_handle.EncodeTo(&amp;handle_encoding);
          meta_index_block.Add(key,handle_encoding);
     }
     // TODO(postrelease): Add stats and other metablocks
     WriteBlock(&amp;meta_index_block, &amp;metaindex_block_handle);
}
</code></pre><p><strong>S4 &#x5199;&#x5165;index block&#xFF0C;&#x5982;&#x679C;&#x6210;&#x529F;Flush&#x8FC7;data block&#xFF0C;&#x90A3;&#x4E48;&#x9700;&#x8981;&#x4E3A;&#x6700;&#x540E;&#x4E00;&#x5757;data block&#x8BBE;&#x7F6E;index block&#xFF0C;&#x5E76;&#x52A0;&#x5165;&#x5230;index block&#x4E2D;&#x3002;</strong></p>
<pre class="language-"><code>if (ok()) 
{
     if (r-&gt;pending_index_entry)
     { 
          // Flush&#x65F6;&#x4F1A;&#x88AB;&#x8BBE;&#x7F6E;&#x4E3A;true
          r-&gt;options.comparator-&gt;FindShortSuccessor(&amp;r-&gt;last_key);
          std::string handle_encoding;
          r-&gt;pending_handle.EncodeTo(&amp;handle_encoding);
          r-&gt;index_block.Add(r-&gt;last_key, Slice(handle_encoding)); 
          // &#x52A0;&#x5165;&#x5230;index block&#x4E2D;
          r-&gt;pending_index_entry =false;
      }
      WriteBlock(&amp;r-&gt;index_block, &amp;index_block_handle);
}
</code></pre><p><strong>S5 &#x5199;&#x5165;Footer&#x3002;</strong></p>
<pre class="language-"><code>if (ok()) 
{
     Footer footer;
     footer.set_metaindex_handle(metaindex_block_handle);
     footer.set_index_handle(index_block_handle);
     std::string footer_encoding;
     footer.EncodeTo(&amp;footer_encoding);
     r-&gt;status =r-&gt;file-&gt;Append(footer_encoding);
     if (r-&gt;status.ok()) 
     {
          r-&gt;offset +=footer_encoding.size();
     }
}
</code></pre><p>&#x6574;&#x4E2A;&#x5199;&#x5165;&#x6D41;&#x7A0B;&#x5C31;&#x5206;&#x6790;&#x5B8C;&#x4E86;&#xFF0C;&#x5BF9;&#x4E8E;<strong>Datablock&#x548C;Filter Block</strong>&#x7684;&#x64CD;&#x4F5C;&#x5C06;&#x5728;<strong>Data block&#x548C;Filter Block&#x4E2D;</strong>&#x5355;&#x72EC;&#x5206;&#x6790;&#xFF0C;&#x4E0B;&#x9762;&#x7684;&#x8BFB;&#x53D6;&#x76F8;&#x540C;&#x3002;</p>
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